#!/usr/bin/env python3
"""P39 evidence: NEAREST 2x close-ups of the new Jiangnan elements.

Takes the real 1280x720 game frames captured by the `LV_P39_SHOT=1` hook and
crops the new-element regions, upscaling exactly 2x with NEAREST so pixel edges
stay sharp (no mixed colours). Deterministic: fixed crop boxes, pure function of
the input PNGs, so running twice yields byte-identical output.

Usage:
    python3 scripts/make-p39-closeups.py <record-dir> <out-dir>
"""

import sys
from pathlib import Path

from PIL import Image

# (source frame, crop box x0,y0,x1,y1, output name)
CROPS = [
    ("p39-day.png", (500, 180, 820, 420), "p39-closeup-2x.png"),
    ("p39-lantern-night.png", (150, 270, 470, 450), "p39-closeup-lantern-2x.png"),
]


def main(argv):
    if len(argv) != 3:
        sys.stderr.write(__doc__)
        return 2
    record_dir = Path(argv[1])
    out_dir = Path(argv[2])
    out_dir.mkdir(parents=True, exist_ok=True)
    for source_name, box, out_name in CROPS:
        source = Image.open(record_dir / source_name).convert("RGBA")
        crop = source.crop(box)
        doubled = crop.resize((crop.width * 2, crop.height * 2), Image.NEAREST)
        doubled.save(out_dir / out_name)
        print(f"ok {out_name} {doubled.width}x{doubled.height} from {source_name} box={box}")
    return 0


if __name__ == "__main__":
    raise SystemExit(main(sys.argv))